======================================
| [  737.749556][    C0]  #3: ffffffffba37dcc0 (rcu_read_lock){....}-{1:3}, at: ip_output (./include/linux/rcupdate.h:300 (discriminator 2) ./include/linux/rcupdate.h:840 (discriminator 2) net/ipv4/ip_output.c:432 (discriminator 2))
| [  737.749774][    C0]  #4: ffffffffba37dcc0 (rcu_read_lock){....}-{1:3}, at: ip_finish_output2 (./include/linux/rcupdate.h:300 (discriminator 2) ./include/linux/rcupdate.h:840 (discriminator 2) net/ipv4/ip_output.c:229 (discriminator 2))
| [  737.749942][    C0]
| [  737.749942][    C0] stack backtrace:
[  737.750114][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  737.750116][    C0] Call Trace:
[  737.750118][    C0]  <IRQ>
[  737.750119][    C0]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[  737.750122][    C0]  print_circular_bug.cold (kernel/locking/lockdep.c:2043)
[  737.750125][    C0]  check_noncircular (kernel/locking/lockdep.c:2175)
[  737.750128][    C0]  check_prev_add (kernel/locking/lockdep.c:3165)
[  737.750131][    C0]  validate_chain (kernel/locking/lockdep.c:3284 kernel/locking/lockdep.c:3908)
[  737.750133][    C0]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  737.750135][    C0]  __lock_acquire (kernel/locking/lockdep.c:5237)
[  737.750138][    C0]  lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  737.750140][    C0]  ? ___neigh_create (./include/linux/spinlock.h:348 net/core/neighbour.c:670)
[  737.750142][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  737.750145][    C0]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[  737.750147][    C0]  _raw_spin_lock_bh (./include/linux/spinlock_api_smp.h:150 (discriminator 1) kernel/locking/spinlock.c:182 (discriminator 1))
[  737.750149][    C0]  ? ___neigh_create (./include/linux/spinlock.h:348 net/core/neighbour.c:670)
[  737.750151][    C0]  ___neigh_create (./include/linux/spinlock.h:348 net/core/neighbour.c:670)
[  737.750152][    C0]  ? sync_exp_reset_tree_hotplug (kernel/rcu/tree_exp.h:96)
[  737.750155][    C0]  ip_finish_output2 (./include/net/route.h:411 ./include/net/route.h:425 net/ipv4/ip_output.c:230)
[  737.750157][    C0]  ? ip_dst_mtu_maybe_forward (./include/linux/rcupdate.h:873 ./include/net/ip.h:504)
[  737.750159][    C0]  ? ip4_dst_hoplimit (./include/net/dst.h:582 (discriminator 4) ./include/net/dst.h:587 (discriminator 4) ./include/net/route.h:395 (discriminator 4))
[  737.750161][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  737.750163][    C0]  ip_output (./include/linux/netfilter.h:314 net/ipv4/ip_output.c:437)
[  737.750165][    C0]  ? ip_finish_output (./include/linux/cgroup.h:868)
[  737.750167][    C0]  ? __ip_make_skb (net/ipv4/ip_output.c:1386 net/ipv4/ip_output.c:1497)
[  737.750170][    C0]  ip_push_pending_frames (./include/net/dst.h:470 (discriminator 4) net/ipv4/ip_output.c:131 (discriminator 4) net/ipv4/ip_output.c:1506 (discriminator 4) net/ipv4/ip_output.c:1526 (discriminator 4))
[  737.750173][    C0]  __icmp_send (net/ipv4/icmp.c:1015)
[  737.750176][    C0]  ? icmpv4_global_allow (net/ipv4/icmp.c:303 (discriminator 42))
[  737.750178][    C0]  ? mark_usage (kernel/locking/lockdep.c:4642)
[  737.750179][    C0]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  737.750181][    C0]  ? __lock_acquire (kernel/locking/lockdep.c:453 kernel/locking/lockdep.c:5225)
[  737.750183][    C0]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  737.750187][    C0]  ? sched_balance_find_src_group (kernel/sched/fair.c:12797)
[  737.750191][    C0]  ipv4_send_dest_unreach (net/ipv4/route.c:1282)
[  737.750193][    C0]  ? ip_do_redirect (net/ipv4/route.c:864)
[  737.750196][    C0]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  737.750198][    C0]  ipv4_link_failure (net/ipv4/route.c:1289)
[  737.750199][    C0]  arp_error_report (./include/net/dst.h:438 net/ipv4/arp.c:299)
[  737.750201][    C0]  neigh_invalidate (net/core/neighbour.c:1057)
[  737.750204][    C0]  ? neigh_periodic_work (net/core/neighbour.c:973 (discriminator 3))
[  737.750206][    C0]  neigh_timer_handler (net/core/neighbour.c:1149)
[  737.750208][    C0]  ? neigh_periodic_work (net/core/neighbour.c:973 (discriminator 3))
[  737.750209][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  737.750211][    C0]  call_timer_fn (kernel/time/timer.c:1748)
[  737.750213][    C0]  ? detach_if_pending (./include/linux/list.h:1143)
[  737.750214][    C0]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  737.750216][    C0]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  737.750218][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  737.750220][    C0]  __run_timers (kernel/time/timer.c:1799 kernel/time/timer.c:2374)
[  737.750221][    C0]  ? neigh_periodic_work (net/core/neighbour.c:973 (discriminator 3))
[  737.750224][    C0]  ? __bpf_trace_itimer_expire (./include/trace/events/timer.h:407)
[  737.750225][    C0]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  737.750228][    C0]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[  737.750230][    C0]  run_timer_softirq (kernel/time/timer.c:2386 kernel/time/timer.c:2395 kernel/time/timer.c:2403)
[  737.750232][    C0]  ? clockevents_program_event (kernel/time/clockevents.c:372)
[  737.750235][    C0]  ? __run_timers (./include/trace/events/timer.h:138 (discriminator 19))
[  737.750236][    C0]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[  737.750239][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  737.750240][    C0]  handle_softirqs (kernel/softirq.c:622)
[  737.750243][    C0]  ? _local_bh_enable (kernel/softirq.c:405 (discriminator 1))
[  737.750246][    C0]  __irq_exit_rcu (kernel/softirq.c:656 kernel/softirq.c:496 kernel/softirq.c:735)
[  737.750248][    C0]  irq_exit_rcu (kernel/softirq.c:752)
[  737.750250][    C0]  sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1062 (discriminator 37) arch/x86/kernel/apic/apic.c:1062 (discriminator 37))
[  737.750252][    C0]  </IRQ>
[  737.750252][    C0]  <TASK>
[  737.750253][    C0]  asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:674)
[  737.750255][    C0] RIP: 0010:_raw_write_unlock_irq (./include/linux/rwlock_api_smp.h:302 (discriminator 1) kernel/locking/spinlock.c:362 (discriminator 1))
[  737.750257][    C0] Code: 0f 1f 44 00 00 53 48 8b 74 24 08 48 89 fb 48 83 c7 18 e8 55 5b c1 fd 48 89 df e8 2d b9 c1 fd e8 78 49 e9 fd fb bf 01 00 00 00 <e8> bd 93 b3 fd 65 8b 05 66 84 f8 01 85 c0 74 02 5b c3 e8 4b b0 64
All code
========
   0:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   5:	53                   	push   %rbx
   6:	48 8b 74 24 08       	mov    0x8(%rsp),%rsi
   b:	48 89 fb             	mov    %rdi,%rbx
   e:	48 83 c7 18          	add    $0x18,%rdi
  12:	e8 55 5b c1 fd       	call   0xfffffffffdc15b6c
  17:	48 89 df             	mov    %rbx,%rdi
  1a:	e8 2d b9 c1 fd       	call   0xfffffffffdc1b94c
  1f:	e8 78 49 e9 fd       	call   0xfffffffffde9499c
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
  2a:*	e8 bd 93 b3 fd       	call   0xfffffffffdb393ec		<-- trapping instruction
  2f:	65 8b 05 66 84 f8 01 	mov    %gs:0x1f88466(%rip),%eax        # 0x1f8849c
  36:	85 c0                	test   %eax,%eax
  38:	74 02                	je     0x3c
  3a:	5b                   	pop    %rbx
  3b:	c3                   	ret
  3c:	e8                   	.byte 0xe8
  3d:	4b b0 64             	rex.WXB mov $0x64,%r8b

Code starting with the faulting instruction
===========================================
   0:	e8 bd 93 b3 fd       	call   0xfffffffffdb393c2
   5:	65 8b 05 66 84 f8 01 	mov    %gs:0x1f88466(%rip),%eax        # 0x1f88472
   c:	85 c0                	test   %eax,%eax
   e:	74 02                	je     0x12
  10:	5b                   	pop    %rbx
  11:	c3                   	ret
  12:	e8                   	.byte 0xe8
  13:	4b b0 64             	rex.WXB mov $0x64,%r8b
[  737.750259][    C0] RSP: 0018:ffa0000002ddfd60 EFLAGS: 00000282
[  737.750261][    C0] RAX: 00000000000074dd RBX: ffffffffba00a080 RCX: ffffffffb9530bb8
[  737.750263][    C0] RDX: ff11000014aa46c0 RSI: ffffffffb9e1781f RDI: 0000000000000001
[  737.750264][    C0] RBP: ffa0000002ddfdb0 R08: 0000000000000000 R09: 0000000000000000
[  737.750265][    C0] R10: 0000000000000000 R11: 0000000000000001 R12: 1ff40000005bbfb2
[  737.750265][    C0] R13: ff11000014aa4fb0 R14: ff11000014aa4c58 R15: ff1100000c9816c0
[  737.750267][    C0]  ? _raw_write_unlock_irq (./include/linux/rwlock_api_smp.h:301 kernel/locking/spinlock.c:362)
[  737.750269][    C0]  exit_notify (kernel/exit.c:806)
[  737.750271][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  737.750273][    C0]  ? forget_original_parent (./include/linux/list.h:177)
[  737.750275][    C0]  ? do_raw_spin_unlock (./include/linux/instrumented.h:82 ./include/linux/atomic/atomic-instrumented.h:32 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141)
[  737.750276][    C0]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:178 (discriminator 6) kernel/locking/spinlock.c:198 (discriminator 6))
[  737.750278][    C0]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:179 (discriminator 1) kernel/locking/spinlock.c:198 (discriminator 1))
[  737.750279][    C0]  ? exit_tasks_rcu_start (kernel/rcu/tasks.h:1301 (discriminator 1))
[  737.750283][    C0]  do_exit (kernel/exit.c:1021)
[  737.750284][    C0]  ? exit_notify (kernel/exit.c:781)
[  737.750286][    C0]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  737.750288][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  737.750290][    C0]  do_group_exit (kernel/exit.c:1152)
[  737.750292][    C0]  __x64_sys_exit_group (kernel/exit.c:1163 kernel/exit.c:1161 kernel/exit.c:1161)
[  737.750294][    C0]  x64_sys_call (./arch/x86/include/generated/asm/syscalls_64.h:232)
[  737.750296][    C0]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  737.750297][    C0]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[  737.750299][    C0]  ? exc_page_fault (arch/x86/mm/fault.c:1489 (discriminator 3) arch/x86/mm/fault.c:1536 (discriminator 3))
[  737.750301][    C0]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[  737.750303][    C0] RIP: 0033:0x7f21cc7741b8
[  737.750306][    C0] Code: Unable to access opcode bytes at 0x7f21cc77418e.

Code starting with the faulting instruction
===========================================
[  737.750308][    C0] RSP: 002b:00007ffc1a8a1ab8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[  737.750310][    C0] RAX: ffffffffffffffda RBX: 00007f21cc8a4f88 RCX: 00007f21cc7741b8
[  737.750311][    C0] RDX: 00007f21cc4befc8 RSI: fffffffffffffeb8 RDI: 0000000000000000
[  737.750312][    C0] RBP: 00007ffc1a8a1b10 R08: 0000000000000000 R09: 0000000000000020
[  737.750313][    C0] R10: 00007ffc1a8a18d0 R11: 0000000000000246 R12: 0000000000000001


Finger prints:
check_prev_add:validate_chain:__lock_acquire:_raw_spin_lock_bh:___neigh_create